Masse Dominique auteur aut IRD Cambier Christophe auteur aut IRD Brauman Alain auteur aut IRD Sall Saïdou auteur aut IRD Assigbetsé Komi auteur aut IRD Chotte Jean-Luc auteur aut IRD text journalArticle eng text/pdf born digital access An individual-based model, called MIOR, was designed to assess hypotheses on the effect of the spatial distribution of organic matter and microbial decomposers on soil carbon and nitrogen dynamics. Two main types of object were defined to represent the decomposers and the soil organic substrates. All these objects were positioned in a 3D space. The exchange of carbon and nitrogen between these various entities was simulated. Two scenarios were tested according to the degrees of clustering of organic matter and of microorganisms. The results of simulations highlighted the effect of the ratio of accessible organic carbon to microbial carbon on the dynamics of microbial biomass and CO2 release. This ratio was determined by the number of contacts between one object representing the microbial decomposers and the surrounding objects representing the organic substrates. specialized 068 58 5 1127-1135 2007 1351-0754 https://www.documentation.ird.fr/hor/fdi:010040742 10.1111/j.1365-2389.2007.00900.x 1351-0754 [F B010040742] https://www.documentation.ird.fr/hor/fdi:010040742 https://www.documentation.ird.fr/intranet/publi/2007/10/010040742.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2007-11-06 2022-09-09 fdi:010040742 fre